When light incident normally on thin film the path difference depends upon ________________?
(A) thickness of the film only
(B) nature of the film only
(C) angle of indidence only
(D) all thickness nature and angle of incidence
Crystals of a material can behave as_________________?
(A) Convex lens
(B) Interferometer
(C) Diffraction grating
(D) Concave
In the shadow of a ball the central portion appears bright that happens due to_________________?
(A) Interference
(B) Diffraction
(C) Polarization
(D) Refraction
In double slit experiment if one of the two slit is covered then________________?
(A) no interference fringes are observed
(B) no diffraction fringes are observed
(C) no fringes observed
(D) interference pattern not disturbed
In monochromatic red light a blue book will probably appear to be_________________?
(A) black
(B) purple
(C) green
(D) no scientific reasoning available
Which one of the following cannot be polarized ?
(A) radio waves
(B) ultraviolot rays
(C) X-rays
(D) sound waves
In a plane polarized light _________________?
(A) vibration in all direction
(B) vibration in two mutually perpendicular directions
(C) vibration take place in a direction perpendicular to the direction of propagation of light
(D) no vibration at all
Wavelength of X-rays falling at glancing angle of 30? on a crystal with atmic spacing 2 x 10-10 for the fist order diffraction is________________?
(A) 4 x 10-10 m
(B) 2 x 10-10 m
(C) 0.02×10-10m
(D) 20×10-10m
When one mirror of a Michelson Interferometer is moved a distance of 0.5 mm we observe 2000 fringes. What will be wavelength of light used ?
(A) 5000 nm
(B) 5000A
(C) 500m
(D) 2000um